Vacuum cleaner nozzle and vacuum apparatus

ABSTRACT

The invention offers a vacuum cleaner nozzle and vacuum apparatus which can ensure air tightness and prevent vacuum mouth from tilting up. The vacuum cleaner nozzle offered is to be matched with air duct connecting portion of vacuum apparatus, which includes a connecting duct connected to air duct connecting portion; a nozzle main body, having exhaust port which corresponds to air duct connecting portion and is rotatably connected to the other end of connecting duct; a hollow accommodating part which is located in front of exhaust port as well as vacuum mouth which is provided on hollow accommodating part and directed toward surface to be cleaned; a flexible hose, locating between connecting duct and exhaust port with leak-proof fitting; a resilient component butted separately to connecting duct and nozzle main body, for keeping included angle between axis of connecting duct and support surface at predetermined angle.

CROSS REFERENCE TO RELATED APPLICATION

This U.S. National Stage claims priority to PCT Application PCT/CN2017/110374 filed on Nov. 10, 2017, which claims priority to China Application No.201720380045.5 filed on Apr. 12, 2017. The entire content of the above-identified priority applications is incorporated herein by reference.

FIELD

The invention relates to a kind of vacuum cleaner nozzle and vacuum apparatus that contains the vacuum cleaner nozzle.

BACKGROUND

Vacuum cleaner nozzle with integrated motor (also referred to as power nozzle) has already been widely known, this kind of nozzle often has a high speed roller brush, for flapping carpet and agitating dust in depth of carpet in order to remove it by suction airflow. For power nozzle, roller brush is driven by motor inside nozzle, kinetic energy of suction airflow is completely used for dust cleaning, comparing to air driven brush that drives turbine by suction airflow and then drives roller brush, power nozzle has higher dust-cleaning efficiency on carpet. Power nozzle is often used with AC vacuum cleaner. Because AC vacuum cleaner has strong suction force, the nozzle will firmly be held on carpet surface and create large moving resistance. In order to reduce moving resistance for user to easily move nozzle on carpet surface, bottom surface or top surface of these nozzles should have leaking windows to ensure easy moving and tight fitting between power nozzle and carpet.

With developing of lithium battery cell, rechargeable DC vacuum cleaner is becoming more and more popular. The DC vacuum cleaner is small in size, light in weight, easy for operation, low in noise, though suction is relatively weak, it's sufficient to remove dust on hard floor. When DC vacuum cleaner is used to clean mattress, sofa and other fabric furniture as well as small area of undercoat carpet, power nozzle with integrated motor can significantly improve cleaning efficiency because internal motor can drive roller brush to dust in depth of fabric furniture and undercoat carpet will be agitated and removed by relatively small suction of DC vacuum cleaner.

Because suction of DC vacuum cleaner is relatively weak, binding force between nozzle with integrated motor (power nozzle) and surface to be cleaned is also weak. When users push and pull such nozzle on surface to be cleaned, as the distance between nozzle and user's body changes, included angle between push-pull force applied to nozzle by user and nozzle main body also changes, front or rear of nozzle may lift up from surface to be cleaned and lead to and lead to air-leakage to reduce dust-picking ability.

CN201010123562.7 Dyson disclosed a kind of vacuum cleaner nozzle with built-in motor, and base plate can rotate relative to head (i.e. nozzle main body). When user combines such nozzle with DC vacuum cleaner for use on horizontal smooth surface, in the process of pulling back of vacuuming, as nozzle gradually approaches user's body, included angle between nozzle tail adapter and horizontal smooth surface increases gradually, because nozzle head can rotate relative to base plate, rear of nozzle base plate won't raise up to leave horizontal smooth surface, instead it can keep adhering to horizontal smooth surface.

However, in the structure disclosed by CN201010123562.7 Dyson, nozzle base plate and nozzle main body (head) get friction fit through a large area of curved surface in the front and rear side, and realize rotation and sealing, interconnected curved surface should not only be able rotate freely to each other, but also ensure sealing during rotation, it requires high precision of plastic parts and it's difficult to machine, thus product rotation flexibility and air tightness is difficult to be guaranteed simultaneously in mass production.

SUMMARY

The invention aims to provide a kind of vacuum cleaner nozzle that can resolve above problems and vacuum apparatus that contains the vacuum cleaner nozzle.

The invention adopts following structures in order to achieve above objectives:

(Structure I)

The invention discloses a kind of vacuum cleaner nozzle, which can be matched with air duct connecting portion of vacuum cleaner for cleaning dust on surfaces to be cleaned, is featured as follows, comprising: connecting duct, one end is connected to air duct connecting portion; nozzle main body, comprises exhaust port which corresponds to air duct connecting portion and is rotatably connected to the other end of connecting duct; hollow accommodating part which is located in front of exhaust port as well as vacuum mouth which is provided on hollow accommodating part and directed toward surface to be cleaned; vacuum mouth comprises support surface that is in contact with surface to be cleaned; flexible hose, locates between connecting duct and exhaust port, and provides air-tight connection between connecting duct and exhaust port; resilient component, which is separately butted to connecting duct and nozzle main body for keeping included angle between axis of connecting duct that leads to said air duct connecting portion and support surface at predetermined angle, wherein, while vacuum cleaner nozzle is at free state, connecting duct contacts with nozzle main body, included angle between axis of connecting duct that leads to said air duct connecting portion and support surface is the minimum. when vacuum cleaner nozzle is in vacuuming mode, resilient component can prevent included angle between axis of connecting duct that leads to said air duct connecting portion and support surface from increasing.

In addition, vacuum cleaner nozzle involved in the invention may also be featured as follows: hollow accommodating part, vacuum mouth as well as exhaust port are integrally molded, in this way it may better ensure air tightness.

In addition, vacuum cleaner nozzle involved in the invention may also be featured as follows: bottom of connecting duct front end is equipped with under shed, supporting mechanism is provided between connecting duct and vacuum mouth, when vacuum cleaner nozzle is in free state on a level surface, edge of under shed is butted to supporting mechanism, included angle between axis of connecting duct that leads to said air duct connecting portion and surface to be cleaned is greater than zero, when connecting duct turns to the direction deviating from supporting mechanism, resilient component drives supporting mechanism to rotate toward connecting duct.

Moreover, vacuum cleaner nozzle involved in the invention may also be featured as follows: resilient component is torsion spring, and it comprises: primary torque arm which is installed on connecting duct and makes synchronous rotation with connecting duct, and secondary torque arm which is butted to nozzle main body.

Besides, vacuum cleaner nozzle involved in the invention may also be featured as follows: hollow accommodating part, comprising hollow case and mounting unit, mounting unit is fixed on hollow case, comprising: mounting ear; mounting hole fixed on said mounting ear; and reset rib fixed in mounting ear. Said reset rib is set on the opposite direction to outer surface of hollow case, both of which coordinate to form clamp butting part that clamps secondary torque arm and are butted to the secondary torque arm. Said connecting duct comprises erection column rotatably set in said mounting hole, and mounting groove used to install primary torque arm is set on the erection column.

Besides, vacuum cleaner nozzle involved in the invention may also comprises: roller brush component that is rotatably installed in hollow accommodating part; as well as motor that drives roller brush component rotation.

In addition, vacuum cleaner nozzle involved in the invention may also be featured as follows: nozzle main body also comprises motor mounting portion, which is set on back side of hollow accommodating part and used to accommodate and install motor; vacuum mouth comprises: dust inlet formed on hollow accommodating part, and front base plate and rear base plate set at dust inlet perimeter. Motor mounting portion is located above rear base plate.

In addition, vacuum cleaner nozzle involved in the invention may also be featured as follows: motor mounting portion is used as supporting mechanism, shape of under shed corresponds to that of motor mounting portion, when edge of under shed contacts with motor mounting portion, elastic force exerted by resilient component on nozzle main body is the minimum.

Moreover, vacuum cleaner nozzle involved in the invention may also be featured as follows: while nozzle main body locates on horizontal plane and edge of under shed is butted to motor mounting portion, included angle between axis of connecting duct that leads to air duct connecting portion and horizontal plane is at predetermined angle, which is 15°˜45°, preferably 20°.

(Structure II)

Furthermore, the invention also provides a kind of vacuum apparatus, which is featured as follows, comprising: vacuum cleaner main body comprises air duct connecting portion; and vacuum cleaner nozzle that is matched with the air duct connecting portion, wherein, said vacuum cleaner nozzle is anyone as described in (structure I).

Role and Effect of Invention

According to vacuum cleaner nozzle and vacuum apparatus as described in the invention, because connecting duct and nozzle main body are connected in a rotatable manner, flexible hose connects nozzle main body and connecting duct in leak-proof manner, flexibility of hose can ensure relative-rotation freedom between connecting duct and nozzle main body, when the vacuum cleaner nozzle is used to collect dust on smooth surface and kept away from user's body, included angle between connecting duct and nozzle main body may be minimum, when nozzle approaches user's body, included angle between connecting duct and nozzle main body can increase properly, here resilient component won't generate excessive elasticity, rear of nozzle won't raise up, vacuum mouth keeps adherence to smooth surface to be cleaned. Furthermore compared with sealing difficulty of large area friction fit, hose sealing is much easier to produce , and it's easier to ensure rotation flexibility and sealing property in mass production.

Furthermore, because resilient component is provided between connecting duct and nozzle main body, and the resilient component is respectively butted to connecting duct and nozzle main body, it can exert elastic force on nozzle main body and avoid front side of vacuum mouth from rising up because of excessive resistance caused by mattress surface wrinkles on back side of vacuum cleaner nozzle when vacuum cleaner nozzle is in pulling-back process during vacuuming, because resilient component urges nozzle main body to approach connecting duct and thus makes front of nozzle main body submerge, users don't need to actively change angle of arm in order to keep vacuum mouth in close contact with mattress surface, and it ensures vacuum efficiency on soft surfaces such as mattress.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is the isometric view of vacuum cleaner nozzle among embodiment of the invention from the front;

FIG. 2 is the isometric view of vacuum cleaner nozzle among embodiment of the invention from the bottom;

FIG. 3 is the exploded view I of vacuum cleaner nozzle among embodiment of the invention;

FIG. 4 is the exploded view II of vacuum cleaner nozzle among embodiment of the invention;

FIG. 5 is the top view of vacuum cleaner nozzle among embodiment of the invention;

FIG. 6 is the A-A section view of FIG. 5; as well as

FIG. 7 is the enlarged view of partial structure of vacuum cleaner nozzle among embodiment of the invention, wherein, FIG. 7(a) is the enlarged view of area I in FIG. 3, and FIG. 7(b) is the enlarged view of area II in FIG. 4.

DETAILED DESCRIPTION Mode of Carrying Out the Invention

The following is a detailed description of vacuum cleaner nozzle and vacuum apparatus involved in the invention by referring to figures.

Embodiment

Vacuum apparatus comprises vacuum cleaner nozzle 10 shown in FIG. 1 and air duct connecting portion as well as dust collection part which is not shown in figure (that is vacuum cleaner main body). Vacuum cleaner nozzle 10 is matched with air duct connecting portion for the purpose of vacuuming dust, hair and other debris on surface to be cleaned. Dust collection part provides vacuum cleaner nozzle 10 with suction, adsorbs dust, hair, etc which is cleaned by vacuum cleaner nozzle 10, and serves as dust collection mechanism to contain dust.

As is shown in FIG. 1-3, vacuum cleaner nozzle 10 can with air duct connecting portion of vacuum apparatus which is not shown in figure, is used to remove dust on surface to be cleaned and comprises: nozzle main body 11, roller brush component 12, driving component 13, connecting duct 14, resilient component 15 as well as flexible hose 16.

Nozzle main body 11 comprises hollow accommodating part 111, vacuum mouth 112, exhaust port 113, motor mounting portion 114 as well as covering mounting portion 115.

As is shown in FIG. 3 and FIG. 4, hollow accommodating part 111 comprises hollow case 111-1 and mounting unit 111-2. Interior of hollow case 111-1 is a cylinder cavity, which is used to accommodate and install roller brush component 12 and comprises integrally molded: left side plate 111-1 a, right side plate 111-1 b, left side opening 111-1 c, right side opening 111-1 d as well as hollow positioning cylinder 111-1 e.

Mounting unit 111-2 is fixed on hollow case 111-1, comprises integrally molded: left mounting ear 111-2 a, right mounting ear 111-2 b, left mounting hole 111-2 c, right mounting hole 111-2 d and reset rib 111-2 e which is fixed in right mounting ear 111-2 b.

Vacuum mouth 112 is set on hollow accommodating part 111 and faces to surface to be cleaned, comprises: dust inlet 112-1, front base plate 112-2 and rear base plate 112-3. Dust inlet 112-1 is formed on hollow case 111-1, and front base plate 112-2 and rear base plate 112-3 are established at periphery of dust inlet 112-1. Vacuum mouth 112 comprises support surface which is in contact with surface to be cleaned.

Exhaust port 113 is established on hollow accommodating part 111 and corresponds to air duct connecting portion.

In this embodiment, hollow accommodating part 111, vacuum mouth 112 as well as exhaust port 113 are integrally molded for better air tightness.

Motor mounting portion 114 is of hollow structure, established at back side of hollow accommodating part 111, located above rear base plate 112-3 and used to accommodate and install motor.

Covering mounting portion 115 comprises: right end cover 115-1, left cover plate 115-2, left ear cover plate 115-3 as well as right ear cover plate 115-4.

Roller brush component 12 is rotatably installed within hollow accommodating part 111, and comprises cylinder base and multiple brush filaments which are established on base.

As is shown in FIG. 3, driving component 13 locates on rear outside of nozzle main body 11 and left side of connecting duct 14, comprises: motor 131, timing belt 132, belt pulley 133, drive head 134, left bearing 135, right bearing 136 as well as transmission yoke 137.

Motor 131 is installed in motor mounting portion 114, and can drive roller brush component 12 to rotate through timing belt 132.

As is shown in FIG. 2-4, middle part of right side plate 111-1 b is provided with right side opening 111-1 d, interior of which is equipped with clamping groove; right bearing 136 locates inside right end cover 115-1, and it runs through right side opening 111-1 d to match with steel shaft 121 on right side of roller brush component 12, and makes right side of roller brush component 12 rotate inside right end cover 115-1; outside of right end cover 115-1 is equipped with switch groove 115-1 a, and inside is equipped with buckle 115-1 b; inside of right side opening 111-1 d on right side plate 111-b is provided with clamping groove, after left side of right end cover 115-1 enters right side opening 111-1 d and makes clockwise rotation, buckle 115-1 b can enter clamping groove and closely fit with it, when necessary, user can unlock buckle 115-1 b from clamping groove and take right end cover 115-1 out of right side of roller brush component 12 by means of inserting a sheet in switch groove 115-1 a for anticlockwise rotation.

As shown in FIG. 3, left side opening 111-1 c is set on left side of hollow case 111-1, left hand side of roller brush component 12 runs through left side opening 111-1 c and matches with drive head 134 on the outside. Inner bore on left side of roller brush component 12 is provided with passive rib 122 and passive groove 123, which are at internal distribution and separately mesh with corresponding driving rib and driving groove on drive head 134, and enable roller brush component 12 to rotate after receiving torque force transferred by drive head 134.

Belt pulley 133 is set on left side of drive head 134, middle part of right side of belt pulley 133 passes through left bearing 135 to combine with left side of drive head 134 through the medium of rib groove structure, and is reinforced by screw 138 locking.

Outer diameter of left side of drive head 134 is greater than inner diameter of bearing hole, thus, after locking drive head 134 and belt pulley 133, it won't pass through bearing inner bore to slide to the left side.

Transmission yoke 137 is set between drive head 134 and belt pulley 133, round hole is provided on transmission yoke 137 to be used as bearing chamber, left bearing 135 is installed in it, right hand side of left bearing 135 is drive head 134, and left side of left bearing 134 is main body of belt pulley 133.

There are three hollow positioning cylinders s111-1 e on left side of left side plane 111-1 a, and they are separately sleeved into three hollow positioning cylinders 137-1 on front right of transmission yoke 137, all left hand sides of three hollow positioning cylinders 111-1 e, which are integrally molded with hollow case 111-1 and locate on left side plate 111-1 a, align with left end plane of transmission yoke 137, make three inner bores 111-1 f of hollow positioning cylinder 111-1 e expose to left end plane of transmission yoke 137. Rear of transmission yoke 137 is fixed together with DC motor 131 through screw 137-2; meanwhile DC motor 131 is clamped and positioned. Rear middle part of transmission yoke 137 is equipped with circular hole 137-3, left end of rotation shaft in motor 131 is provided with belt pulley 131-1, which passes through circular hole137-3 to expose on rear left side of transmission yoke 137, is parallel to belt pulley 133 on left side of roller brush component 12, timing belt 132 is sleeved at periphery of motor 131 belt pulley 131-1 and roller brush component 12 belt pulley 133, moreover it is vertical to rotation shaft of both belt pulley, after motor 131 turns, timing belt 132 also drives synchronous rotation of roller brush component 12.

Lead wire (not shown in figure) on motor 131 enters connecting duct 14 from left mounting hole 111-2 c, and reaches backside of connecting duct 14 along outside of flexible hose 16, then connected to two conductive pins 139-2 which are installed on contact pin bracket 139-1, and puts through circuit on vacuum apparatus through two conductive pins 139-2.

Right ear cover plate 115-4 is mounted on right side of right mounting hole 111-2 d, and achieves tight fit with right mounting hole 111-2 d through buckle structure. Left side of transmission yoke 137 and two belt pulleys are equipped with left cover plate 115-2, on side walls of which are provided with three through holes 115-2 a, which separately align with inner bores 111-1 f of three hollow positioning cylinders 111-1 e, three screws separately pass through three through holes 115-2 a to drive into interior of three hollow positioning cylinders 111-1 e, then left cover plate 115-2 is locked with nozzle main body 11. Left ear cover plate 115-3 at rear of transmission yoke 137 is part of left cover plate 115-2, as left cover plate 115-2 is locked with nozzle main body 11, left ear cover plate 115-3 is also tightly fitted with left mounting hole 111-2 c, thus belt pulley 133, belt pulley 131-1, timing belt 132, motor 131 as well as lead wire are entirely covered to avoid exposure.

As is shown in FIG. 3 and FIG. 4, in this embodiment, shape of connecting duct 14 is linear, one end heads exhaust port 113 and is rotatably installed on hollow accommodating part 111, and the other end is connected to air duct connecting portion. Connecting duct 14 comprises: left clip foot 141, right lip foot 142, erection column 143, mounting groove 144, upper shed 145 as well as under shed 146. connecting duct also may not be linear shape, but in obtuse angle shape.

Left clip foot 141 and right lip foot 142 are respectively set on front right and left side of connecting duct 14, and installed in left mounting hole 111-2 c and right mounting hole 111-2 d respectively, and can turn around axis X2 relative to left mounting ear 111-2 a and right mounting ear 111-2 b.

As is shown in FIG. 3, upper shed 145 is set above connecting duct 14, and makes upper edge 147 of connecting duct 14 shown in FIG. 1, 3-5 locate at rear of axis X2; under shed 146 is set below connecting duct 14, which makes front lower edge of connecting duct 14 locate at rear of axis X2, and shape of under shed 146 corresponds to that of motor mounting portion 114.

As is shown in FIG. 6, when the nozzle locates on horizontal plane and connecting duct 14 turns downward to make lower edge 148 of connecting duct 14 contact with top of motor mounting portion 114, included angle A1 between axis of connecting duct 14 and plane located by dust inlet 112-1 reaches predetermined angle, which can be any value in range of 15°-45°, and 20° is preferred; when the nozzle is on horizontal plane and connecting duct 14 rotates upward to engage upper edge 147 of connecting duct 14 with top of hollow case 111-1, included angle A1 reaches maximum. Included angle A1 between connecting duct 14 and suction base plane may change continuously between maximal value and predetermined angle.

Resilient component 15 is set between connecting duct 14 and nozzle main body 11, moreover it is respectively butted to nozzle main body 11 and connecting duct 14, and aims to exert elastic force on nozzle main body 11 and connecting duct 14 and prevent included angle A1 from being too large. In this embodiment, resilient component 15 is torsion spring 15, which comprises primary torque arm 151 and secondary torque arm 152, primary torque arm 151 is installed on connecting duct 14 and makes synchronous rotation with the connecting duct 14, secondary torque arm 152 is butted against nozzle main body 11.

As is shown in FIGS. 3, 4 and 7, in connecting duct 14, middle part of right lip foot 142 protrudes rightwards to form erection column 143, which is rotatably erected in right mounting hole 111-2 d, mounting groove 144 is established on one end of erection column 143 facing right ear hole cover plate 115-4. Primary torque arm 151 of torsion spring 15 is built in mounting groove 144; reset rib 111-2 e is opposite to outer surface of hollow case 111-1, and they jointly form clamp butting groove to clamp secondary torque arm 152, make front side of secondary torque arm 152 in contact with outer surface of hollow case 111-1, and rear side in contact with reset rib 111-2 e, furthermore, in order to avoid secondary torque arm 152 slide from clamp butting groove to the right side, right side of secondary torque arm 152 is compressed by retaining rib 115-4 a which locates on the inside of right ear cover plate 115-4. Because two torque arms of torsion spring 15 are separately butted to connecting duct 14 and nozzle main body 11, when connecting duct 14 rotates relative to nozzle main body 11, included angle between two torque arms will change, and spring force will be generated in torsion spring to prevent the included angle from changing.

As is shown in FIGS. 3, 4 and 6, when nozzle locates on horizontal plane and lower edge of connecting duct 14 contacts with motor mounting portion 114, included angle A1 is the minimum, spring force exerted by correspondent resilient component 15 on nozzle main body 11 is the minimum; when upper edge of connecting duct 14 is butted to top of hollow case 111-1, included angle A1 reaches maximum, spring force exerted by correspondent resilient component 15 on nozzle main body 11 is also the maximum, which will cause connecting duct 14 and nozzle main body 11 to approach mutually, included angle A2 is decreased until it turns into A1 and makes connecting duct 14 supported by nozzle main body 11.

Linear flexible hose 16 is equipped between connecting duct 14 and exhaust port 113 and interconnects both with seals. Upper edge of nozzle main body 11 and connecting duct 14 form upper shed 145 together above flexible hose 16; lower edge of nozzle main body 11 and connecting duct 14 forms under shed 146 together below flexible hose 16.

As is shown in FIGS. 3, 4 and 6, front outer side of flexible hose 16 is provided with retainer ring 161, flexible hose 16 is installed within exhaust port 113 on rear side of nozzle main body 11 through retainer ring 161, inner diameter of exhaust port 113 doesn't exceed 35 mm, and is far smaller than left-right width of nozzle main body 11 interior cavity, exhaust port 113 is tightly fit with retainer ring 161, back and forth depth of fit is about 30 mm, and after exhaust port 113 is fit with retainer ring 161, exhaust port 113 keeps relative rest with retainer ring 161, this structure ensures leakproof in the front of flexible hose 16. Flexible hosel6 is integrally molded by flexible plastic material and doesn't leak air. Backside of flexible hose 16 extends along air flow direction, as is shown in FIG. 6, outer wall on the end of flexible hose 16 is tightly fit with inner bore of connecting duct 14 and in relative rest, won't leak air either.

In this embodiment, as is shown in FIG. 6, when vacuum cleaner nozzle 10 is at free state without external forces, lower edge 148 of linear connecting duct 14 is butted against backside of nozzle main body 11, and makes included angle between axis of connecting duct 14 and suction mouth bottom surface at predetermined angle.

When in movement, connecting duct 14 is raised up by external force, for example, when in pulling back vacuum cleaner stroke, vacuum cleaner nozzle 10 is pulled from afar to close user's body on mattress surface, sheet between vacuum cleaner nozzle 10 and user may wrinkle and obstacle nozzle from pulling back, further pulling connecting duct 14 will cause front base plate 112-2 of nozzle main body 11 in the trend of tilting up from bed along clockwise direction in FIG. 6 while wrinkle formed from sheet uplift work as supporting point (included angle A1 between connecting duct and vacuum mouth tends to increase), in this case, torsion spring 15 is compressed and generates elastic force, which makes rear base plate 112-3 get over wrinkle on sheet to approach connecting duct 14, dust inlet 112-1 continues to keep adherence to bed and maintains best dust collection effect.

Adsorption force between recharging vacuum cleaner nozzle and surface to be cleaned isn't strong. When cleaning smooth surface, because support surface of vacuum mouth 112 is in sufficient contact with smooth surface to be cleaned and in close fit, when user pulls nozzle back from the farthest point to own body, included angle between connecting duct and support surface is increased, spring force of torsion spring is insufficient to overcome gravity and suction of nozzle, therefore, as nozzle is pulled near user body, included angle between axis of connecting duct that connects to air duct connecting portion and support surface can be increased appropriately, nozzle can also keep adherence to smooth surface to be cleaned and not easily break away from it.

When vacuum cleaner nozzle is used on soft fabric surface like mattress, because there is fluff on it, air gap exists between support surface of vacuum mouth 112 and soft fabric surface. For AC powered vacuum cleaner, these air gaps are trivial, strong suction will tightly absorb the soft surface on support surface of vacuum mouth 112 and ensure cleaning effect. However, because suction of recharging vacuum cleaner is relatively weak, these air gaps will significantly reduce tightness of fit between nozzle main body and soft surface, and make support surface below nozzle more easily break away from soft surface to be cleaned. When user pushes vacuum cleaner nozzle to direction away from body on soft surface, because binding point between connecting duct and nozzle main body locates at back of vacuum mouth 112, pushing force will compress vacuum cleaner nozzle with soft surface tightly. When user pulls back vacuum cleaner nozzle from position away from body, soft fabric surface at back frame of nozzle may wrinkle up, and cause front of vacuum cleaner nozzle to tilt up, included angle A1 between axis of connecting duct that connects to air duct connecting portion and support surface of vacuum mouth 112 is increased, torsion spring generates spring force to avoid A1 from increasing, and endeavors to keep A1 at initial predetermined angle, that is to say, keeps connecting duct in contact with nozzle main body, therefore, back frame of nozzle main body is made to get over soft fabric surface and generate wrinkle, front frame of nozzle main body submerges, vacuum mouth 112 returns to state of combing with mattress surface, support surface below vacuum mouth 112 contacts with fluff on mattress surface, fluff located in vacuum mouth 112 pricks up on mattress surface, air flow passes through these fluffs and brings dust on them into nozzle.

Role and Effect of Embodiment

According to vacuum cleaner nozzle and vacuum apparatus as described in the embodiment, because connecting duct and nozzle main body may be connected in a rotatable manner, flexible hose connects nozzle main body and connecting duct, connecting duct and exhaust port are interconnected with seals, which effectively prevents air leakage, flexibility of flexible hose itself can also ensure relative-rotation flexibility between connecting duct and nozzle main body, when the vacuum cleaner nozzle is used to collect dust on smooth surface and kept away from user's body, included angle between connecting duct and nozzle main body may be the minimum, when nozzle approaches user's body, included angle between connecting duct and nozzle main body can increase properly, here resilient component won't generate excessive elasticity, rear of nozzle won't raise up, suction surface keeps adherence to smooth surface. Furthermore compared with sealing difficulty of large area friction fit, it's relatively simple to adopt manufacturing process of flexible hose sealing, and it's easier to ensure rotation flexibility and sealing property in mass production.

Furthermore, because resilient component is provided between connecting duct and nozzle main body, and the resilient component is respectively butted to connecting duct and nozzle main body, it can exert elastic force on nozzle main body to avoid the case that front of vacuum cleaner nozzle will raise up because of excessive resistance which is caused by reason that mattress surface wrinkles on back side of vacuum cleaner nozzle when vacuum cleaner nozzle is in pulling-back process during mattress surface cleaning. Because resilient component urges nozzle main body to approach connecting duct and thus makes front of nozzle main body submerge, users don't need to actively change angle of arm in order to keep support surface in close contact with mattress surface, and it ensures dust collection effect on soft surfaces such as mattress.

Of course vacuum cleaner nozzle and vacuum apparatus involved in the embodiment are not just limited to structures in above embodiment. Above content is only basic instruction under the concept of this invention, while any equivalent transformation made according to technical proposal of the invention shall fall within the protection scope of the invention.

Among vacuum cleaner nozzle in the invention, torsion spring can be thicker to increase spring force according to actual needs; moreover, roller wheel can be established at back of nozzle main body rear base plate, roller wheel lower edge is generally level to plane of vacuum mouth, which can avoid rear base plate from excessive submergence on mattress surface, meantime won't increase pulling-back resistance. 

1. A vacuum cleaner nozzle, for working with an air duct connecting portion of a vacuum cleaner to clean dust on surfaces to be cleaned, comprising: a connecting duct, one end is for connecting to the air duct connecting portion; a nozzle main body, comprising: an exhaust port which corresponds to the air duct connecting portion and is rotatably connected to the other end of the connecting duct; a hollow accommodating part which is located in front of the exhaust port as well as a vacuum mouth which is provided on the hollow accommodating part and directed toward a surface to be cleaned, wherein the vacuum mouth comprises a support surface that is in contact with the surface to be cleaned; a flexible hose, locates between the connecting duct and the exhaust port and intercocnnects both for leakproof; a resilient component, which separately butts against the connecting duct and the nozzle main body for keeping included angle as predetermined between an axis of the connecting duct that leads to the air duct connecting portion and the support surface.
 2. The vacuum cleaner nozzle of claim 1, wherein the hollow accommodating part, the vacuum mouth and the exhaust port are integrally molded.
 3. The vacuum cleaner nozzle of claim 1, wherein the front bottom end of the connecting duct is equipped with an under shed, wherein a supporting mechanism is provided between the connecting duct and the vacuum mouth, wherein when the vacuum cleaner nozzle is in free state on a level surface, an edge of the under shed is butted to the supporting mechanism, an included angle between an axis of the connecting duct that leads to the air duct connecting portion and the surface to be cleaned is greater than zero, wherein when the connecting duct turns toward direction that deviates from the supporting mechanism, the resilient component drives the supporting mechanism to rotate to the connecting duct.
 4. The vacuum cleaner nozzle of claim 3, wherein the resilient component is a torsion spring, comprising a primary torque arm which is installed on the connecting duct and synchronous rotation with the connecting duct, and a secondary torque arm which is butted to the nozzle main body.
 5. The vacuum cleaner nozzle of claim 4, wherein the hollow accommodating part comprises a hollow case and a mounting unit, and the mounting unit is fixed on the hollow case, comprising: a mounting ear, a mounting hole on the mounting ear, and a reset rib which is fixed in the mounting ear, and the reset rib is set on the opposite direction of outer surface of the hollow case, and in combination forming a clamp butting part that clamps the secondary torque arm and butted against the secondary torque arm, wherein the connecting duct comprises an erection column rotatably set in the mounting hole with a mounting groove in the erection column for installing the primary torque arm.
 6. The vacuum cleaner nozzle of claim 4, further comprising: a roller brush component, rotatably installed in the hollow accommodating part; and a motor for driving the roller brush component to rotate.
 7. The vacuum cleaner nozzle of claim 6, wherein the nozzle main body further comprises a motor mounting portion which is set on a back side of the hollow accommodating part for accommodating and mounting the motor; wherein the vacuum mouth comprises: a dust inlet formed on the hollow accommodating part, and a front base plate and a rear base plate set at a perimeter of the dust inlet, wherein the motor mounting portion locates above the rear base plate.
 8. The vacuum cleaner nozzle of claim 7, wherein the motor mounting portion is used as the supporting mechanism, wherein a shape of the under shed corresponds to that of the motor mounting portion, wherein when an edge of the under shed contacts with the motor mounting portion, an elastic force exerted by the resilient component on the nozzle main body is the weakest.
 9. The vacuum cleaner nozzle of claim 8, wherein when the edge of the under shed contacts with the motor mounting portion, a predetermined angle is 15°-45°.
 10. A vacuum apparatus, for working with an air duct connecting portion of a vacuum cleaner to clean dust on surfaces to be cleaned, comprising: a connecting duct, one end is for connecting to the air duct connecting portion; a nozzle main body, comprising an exhaust port which corresponds to the air duct connecting portion and is rotatably connected to another end of the connecting duct, a hollow accommodating part which is located in front of the exhaust port as well as a vacuum mouth which is provided on the hollow accommodating part and directed toward the surface to be cleaned, the vacuum mouth comprises a support surface that is in contact with the surface to be cleaned; a flexible hose, locating between the connecting duct and the exhaust port and intercocnnecting both for a leakproof; a resilient component, located between the connecting duct and the nozzle main body for preventing changing of an angle between an axis of the connecting duct that leads to the air duct connecting portion and the support surface.
 11. A vacuum apparatus, comprising: a vacuum cleaner main body comprises an air duct connecting portion; and a vacuum cleaner nozzle according to claim 1, for matching with the air duct connecting portion. 